EVALUATION OF AMERICAN COTTON GENOTYPES FOR SUCKING PESTS TOLERANCE.

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dc.contributor.advisorDeshmukh, Dr. S. B.
dc.contributor.authorWAKODE, YOGESH SHAMRAO
dc.date.accessioned2018-07-25T09:39:18Z
dc.date.available2018-07-25T09:39:18Z
dc.date.issued2017-09-14
dc.descriptionAn experiment on “Evaluation of American Cotton Genotypes for Sucking Pests Tolerance” was conducted at Cotton Research Unit, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola during Kharif, 2016-17. Twenty one cotton genotypes were replicated thrice under Randomized Block Design and evaluated for tolerance against sucking pests. The data were recorded on population of sucking pests/leaves at 45 and 60 DAS. Similarly, the data were also collected on physico-morphic traits like hair density (trichome) and gossypol glands/cm2to determine tolerance /susceptibility of cotton genotypes against sucking pest. Besides this biochemical parameters like reducing sugar, nitrogen and protein content in leaves were estimated by standard procedure at 45 and 60 DAS. The observations were recorded on yield and yield contributing characters viz., days to 50 per cent flowering, day to 50 per cent boll bursting, plant height (cm), number of monopodia per plant, number of sympodia per plant, number of bolls per plant, seed cotton yield per plant (g).en_US
dc.description.abstractAn experiment on “Evaluation of American Cotton Genotypes for Sucking Pests Tolerance” was conducted at Cotton Research Unit, Dr. Panjabrao Deshmukh Krishi Vidypeeth, Akola during Kharif, 2016-17. Twenty one cotton genotypes were replicated thrice under Randomized Block Design and evaluated for tolerance against sucking pests. The data were recorded on population of sucking pests/leaves at 45 and 60 DAS. Similarly, the data were also collected on physico-morphic traits like hair density (trichome) and number of gossypol glands/cm2to determine tolerance /susceptibility of cotton genotypes against sucking pest. Besides this biochemical parameters like reducing sugar, nitrogen and protein content in leaves were estimated by standard procedure at 45 and 60 DAS. The observations were recorded on yield and yield contributing characters viz., days to 50 per cent flowering, day to 50 per cent boll bursting, plant height (cm), number of monopodia per plant, number of sympodia per plant, number of bolls per plant, seed cotton yield per plant (g). The detailed findings of the study is presented below It was observed from present study that those genotypes having more trichome density and gossypol glands/cm2 recorded lower population of aphids, leafhoppers and thrips but population of whiteflies on these genotypes was more indicating role of trichome density and gossypol gland in sucking pest resistance. Highest number of hair density (trichomes/cm2) was noted in AKH-2013-3 followed by DHY-286, AKH-1523 and AKH-1524. Highest number of gossypol glands/cm2 was noted in genotype DHY-286 followed by AKH-1301 and AKH-2013-3. The results indicating that genotypes with higher contents of reducing sugar, nitrogen and protein suffer from the attack of aphids, leafhoppers and thrips. Reducing sugar content was minimum in genotype DHY-286 followed by AKH-2013-3, AKH-1523 and AKH-1524. The minimum nitrogen content was in DHY-286 followed by AKH-2013-3 and AKH-1524. Least protein content was noted in DHY-286 followed by AKH-2013-3, AKH-10-3 and AKH-1524. The hair density (trichomes/ cm2) at 45 and 60 DAS on leaf of cotton had negative and significant correlation with number of aphids, leafhoppers, and thrips at 45 and 60 DAS. The reducing sugar, nitrogen content and protein content at 45 and 60 DAS had positive significant correlation with number of aphids, leafhopper and thrips at 45 and 60 DAS. Seed cotton yield had positive and significant correlation with number of bolls and number of sympodia per plant. Finally it is concluded that cotton genotypes viz., AKH-2013-3, DHY-286, AKH-1524, AKH-1523, AKH-1522, AKH-2013-4, AKH-10-2, AKH-10-3, AKH-1302 proved effective to combat the menace of sucking pests as these genotypes are having more trichome density and gossypol glands and these genotypes posses less reducing sugar, nitrogen content and protein content. Moreover, these genotypes also showed the association of the various physicomorphic traits (viz., trichome density and number gossypol glands) and biochemical (reducing sugar, nitrogen and protein content) traits regulating the tolerance in cotton against sucking pests. The correlation studies revealed that the hair density (trichomes) on leaf of cotton had negative and significant correlation with population of aphids, leafhoppers, and thrips. The hair density (trichomes) on leaf of cotton had positive and significant correlation with population of whiteflies. The reducing sugar, nitrogen content and protein content had positive significant correlation with population of aphids, leafhopper and thrips. The reducing sugar, nitrogen content and protein content had negative significant correlation with population of whiteflies.en_US
dc.identifier.citationWAKODE, YOGESH SHAMRAO (2017). Evaluation of American cotton genotypes for sucking pests tolerance. Department of Agricultural Botany, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. M. Sc. 2017. Print. xi, 63P. (Unpublished).en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810061965
dc.keywordsCrops, Field Crops, Gossypium hirsutum, Plant Protection, Pests, Amsacta, Thrips, Bemicia tabaci, Aphis gossypi, Plant Physiology And Biochemistry, Biochemistry, Reducing Sugars, Carrier Proteins, Crop Improvement, Plant Breeding,en_US
dc.language.isoenen_US
dc.pagesxi, 63p.en_US
dc.publisherDr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra.en_US
dc.research.problemIn the investigation an attempt has been made to identify the American cotton genotypes for sucking pests tolerance and to estimate the Correlation coefficient among sucking pest tolerance, its associated characters and yield.en_US
dc.subBotanyen_US
dc.subjectnullen_US
dc.themeThe present study deals with identifying the American cotton genotypes for sucking pests tolerance.en_US
dc.these.typeM.Scen_US
dc.titleEVALUATION OF AMERICAN COTTON GENOTYPES FOR SUCKING PESTS TOLERANCE.en_US
dc.typeThesisen_US
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